Nurse sharks are friendly? The things I remember about them from my childhood book on sharks are: they sleep in big piles on the ocean floor, their eggs are like weird sacks, and they latch on after biting and will not let go
They’re little sea puppies that are perfectly happy to cruise around while you swim with them. At least that’s the grey nurse sharks we get in aus. The ones you’re describing sound more like wobbegongs or similar. The grey nurses need to be in highly oxygenated water.
Grey nurses also used to have a rep as “man eaters” but that was just because of how they looked,not any actual attacks